A vulnerability in gdm could allow a user to activate the gdm setup program if the administrator configured a gdm theme that provided a user list. The user could do so by choosing the setup option from the menu, clicking the user list, then entering his own password instead of root's. The updated packages have been patched to correct this issue.

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Mandriva Linux Security Advisory MDKSA-2006:100
http://www.mandriva.com/security/
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Package : gdm
Date : June 13, 2006
Affected: 2006.0
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Problem Description:
A vulnerability in gdm could allow a user to activate the gdm setup
program if the administrator configured a gdm theme that provided a
user list. The user could do so by choosing the setup option from
the menu, clicking the user list, then entering his own password
instead of root's.
The updated packages have been patched to correct this issue.
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References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2452
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Updated Packages:
Mandriva Linux 2006.0:
52484787cbd6245c3b8a60933d04b0c4 2006.0/RPMS/gdm-2.8.0.4-1.3.20060mdk.i586.rpm
647524fa758a38e234970d1c08bd6737 2006.0/RPMS/gdm-Xnest-2.8.0.4-1.3.20060mdk.i586.rpm
e464e85b60fcfb39e178e94f268e6698 2006.0/SRPMS/gdm-2.8.0.4-1.3.20060mdk.src.rpm
Mandriva Linux 2006.0/X86_64:
c3a140acd7b4a1275c810ddd587e8d3a x86_64/2006.0/RPMS/gdm-2.8.0.4-1.3.20060mdk.x86_64.rpm
27b79ebf1a55d018041f63b3069174af x86_64/2006.0/RPMS/gdm-Xnest-2.8.0.4-1.3.20060mdk.x86_64.rpm
e464e85b60fcfb39e178e94f268e6698 x86_64/2006.0/SRPMS/gdm-2.8.0.4-1.3.20060mdk.src.rpm
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To upgrade automatically use MandrivaUpdate or urpmi. The verification
of md5 checksums and GPG signatures is performed automatically for you.
All packages are signed by Mandriva for security. You can obtain the
GPG public key of the Mandriva Security Team by executing:
gpg --recv-keys --keyserver pgp.mit.edu 0x22458A98
You can view other update advisories for Mandriva Linux at:
http://www.mandriva.com/security/advisories
If you want to report vulnerabilities, please contact
security_(at)_mandriva.com
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Type Bits/KeyID Date User ID
pub 1024D/22458A98 2000-07-10 Mandriva Security Team